+++ /dev/null
-/***********************************************************************
-*
-* if.c
-*
-* Implementation of user-space PPPoE redirector for Linux.
-*
-* Functions for opening a raw socket and reading/writing raw Ethernet frames.
-*
-* Copyright (C) 2000 by Roaring Penguin Software Inc.
-*
-* This program may be distributed according to the terms of the GNU
-* General Public License, version 2 or (at your option) any later version.
-*
-***********************************************************************/
-
-static char const RCSID[] =
-"$Id: if.c,v 1.2 2008/06/09 08:34:23 paulus Exp $";
-
-#define _GNU_SOURCE 1
-#include "pppoe.h"
-#include "pppd/pppd.h"
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#ifdef HAVE_NETPACKET_PACKET_H
-#include <netpacket/packet.h>
-#elif defined(HAVE_LINUX_IF_PACKET_H)
-#include <linux/if_packet.h>
-#endif
-
-#ifdef HAVE_ASM_TYPES_H
-#include <asm/types.h>
-#endif
-
-#ifdef HAVE_SYS_IOCTL_H
-#include <sys/ioctl.h>
-#endif
-
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef HAVE_NET_IF_ARP_H
-#include <net/if_arp.h>
-#endif
-
-/* Initialize frame types to RFC 2516 values. Some broken peers apparently
- use different frame types... sigh... */
-
-UINT16_t Eth_PPPOE_Discovery = ETH_PPPOE_DISCOVERY;
-UINT16_t Eth_PPPOE_Session = ETH_PPPOE_SESSION;
-
-/**********************************************************************
-*%FUNCTION: etherType
-*%ARGUMENTS:
-* packet -- a received PPPoE packet
-*%RETURNS:
-* ethernet packet type (see /usr/include/net/ethertypes.h)
-*%DESCRIPTION:
-* Checks the ethernet packet header to determine its type.
-* We should only be receveing DISCOVERY and SESSION types if the BPF
-* is set up correctly. Logs an error if an unexpected type is received.
-* Note that the ethernet type names come from "pppoe.h" and the packet
-* packet structure names use the LINUX dialect to maintain consistency
-* with the rest of this file. See the BSD section of "pppoe.h" for
-* translations of the data structure names.
-***********************************************************************/
-UINT16_t
-etherType(PPPoEPacket *packet)
-{
- UINT16_t type = (UINT16_t) ntohs(packet->ethHdr.h_proto);
- if (type != Eth_PPPOE_Discovery && type != Eth_PPPOE_Session) {
- error("Invalid ether type 0x%x", type);
- }
- return type;
-}
-
-/**********************************************************************
-*%FUNCTION: openInterface
-*%ARGUMENTS:
-* ifname -- name of interface
-* type -- Ethernet frame type
-* hwaddr -- if non-NULL, set to the hardware address
-*%RETURNS:
-* A raw socket for talking to the Ethernet card. Exits on error.
-*%DESCRIPTION:
-* Opens a raw Ethernet socket
-***********************************************************************/
-int
-openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
-{
- int optval=1;
- int fd;
- struct ifreq ifr;
- int domain, stype;
-
-#ifdef HAVE_STRUCT_SOCKADDR_LL
- struct sockaddr_ll sa;
-#else
- struct sockaddr sa;
-#endif
-
- memset(&sa, 0, sizeof(sa));
-
-#ifdef HAVE_STRUCT_SOCKADDR_LL
- domain = PF_PACKET;
- stype = SOCK_RAW;
-#else
- domain = PF_INET;
- stype = SOCK_PACKET;
-#endif
-
- if ((fd = socket(domain, stype, htons(type))) < 0) {
- /* Give a more helpful message for the common error case */
- if (errno == EPERM) {
- fatal("Cannot create raw socket -- pppoe must be run as root.");
- }
- error("Can't open socket for pppoe: %m");
- return -1;
- }
-
- if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)) < 0) {
- error("Can't set socket options for pppoe: %m");
- close(fd);
- return -1;
- }
-
- /* Fill in hardware address */
- if (hwaddr) {
- strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
- if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
- error("Can't get hardware address for %s: %m", ifname);
- close(fd);
- return -1;
- }
- memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
-#ifdef ARPHRD_ETHER
- if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
- warn("Interface %.16s is not Ethernet", ifname);
- }
-#endif
- if (NOT_UNICAST(hwaddr)) {
- fatal("Can't use interface %.16s: it has broadcast/multicast MAC address",
- ifname);
- }
- }
-
- /* Sanity check on MTU */
- strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
- if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
- error("Can't get MTU for %s: %m", ifname);
- } else if (ifr.ifr_mtu < ETH_DATA_LEN) {
- error("Interface %.16s has MTU of %d -- should be at least %d.",
- ifname, ifr.ifr_mtu, ETH_DATA_LEN);
- error("This may cause serious connection problems.");
- }
-
-#ifdef HAVE_STRUCT_SOCKADDR_LL
- /* Get interface index */
- sa.sll_family = AF_PACKET;
- sa.sll_protocol = htons(type);
-
- strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
- if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
- error("Could not get interface index for %s: %m", ifname);
- close(fd);
- return -1;
- }
- sa.sll_ifindex = ifr.ifr_ifindex;
-
-#else
- strcpy(sa.sa_data, ifname);
-#endif
-
- /* We're only interested in packets on specified interface */
- if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
- error("Failed to bind to interface %s: %m", ifname);
- close(fd);
- return -1;
- }
-
- return fd;
-}
-
-
-/***********************************************************************
-*%FUNCTION: sendPacket
-*%ARGUMENTS:
-* sock -- socket to send to
-* pkt -- the packet to transmit
-* size -- size of packet (in bytes)
-*%RETURNS:
-* 0 on success; -1 on failure
-*%DESCRIPTION:
-* Transmits a packet
-***********************************************************************/
-int
-sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size)
-{
- int err;
-
- if (debug)
- pppoe_log_packet("Send ", pkt);
-#if defined(HAVE_STRUCT_SOCKADDR_LL)
- err = send(sock, pkt, size, 0);
-#else
- struct sockaddr sa;
-
- strcpy(sa.sa_data, conn->ifName);
- err = sendto(sock, pkt, size, 0, &sa, sizeof(sa));
-#endif
- if (err < 0) {
- error("error sending pppoe packet: %m");
- return -1;
- }
- return 0;
-}
-
-/***********************************************************************
-*%FUNCTION: receivePacket
-*%ARGUMENTS:
-* sock -- socket to read from
-* pkt -- place to store the received packet
-* size -- set to size of packet in bytes
-*%RETURNS:
-* >= 0 if all OK; < 0 if error
-*%DESCRIPTION:
-* Receives a packet
-***********************************************************************/
-int
-receivePacket(int sock, PPPoEPacket *pkt, int *size)
-{
- if ((*size = recv(sock, pkt, sizeof(PPPoEPacket), 0)) < 0) {
- error("error receiving pppoe packet: %m");
- return -1;
- }
- if (debug)
- pppoe_log_packet("Recv ", pkt);
- return 0;
-}
projects / ppp.git / blobdiff